<template>
  <div class="com-container">
    <div class="com-chart" ref="rank_ref"></div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
export default {
  computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme () {
      console.log('主题切换了')
      this.chartInstance.dispose()
      this.initChart()
      this.screenAdapter()
      this.updateChart()
    }
  },
  data() {
    return {
      chartInstance: null,
      allData: null,
      startValue: 0,
      endValue: 9,
      timerId: null
    };
  },
  mounted() {
    this.initChart();
    // this.getData();
    this.$socket.send({
      action: 'getData',
      socketType: 'rankData',
      chartName: 'rank',
      value: ''
    })
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
    clearInterval(this.timerId)
    this.$socket.unRegisterCallBack('rankpage')
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.rank_ref, "chalk");
      const initOption = {
        title: {
          text: "┃ 地区销售排行",
          top: 20,
          left: 20,
        },
        tooltip: {
            show: true
        },
        grid: {
          top: "40%",
          left: "5%",
          right: "5%",
          bottom: "5%",
          containLabel: true,
        },
        xAxis: {
          type: "category",
        },
        yAxis: {
          type: "value",
        },
        series: [
          {
            type: "bar",
          },
        ],
      };
      this.chartInstance.setOption(initOption);
      this.chartInstance.on('mouseover', () => {
          clearInterval(this.timerId)
      })
      this.chartInstance.on('mouseout', () => {
          this.startInterval()
      })
    },
    getData(res) {
      // 获取服务器数据，对this.allData进行赋值之后，调用updateChart方法更新图表
      // const { data: res } = await this.$http.get("rank");
      this.allData = res;
      this.allData.sort((a, b) => {
        return b.value - a.value;
      });
      this.updateChart();
      this.startInterval()
    },
    updateChart () {
        const colorArr = [
            ['#0ba82c', '#4ff77b'],
            ['#2e72bf', '#23e5e5'],
            ['#5052ee', '#ab6ee5']
        ]
      // 处理图表需要的数据
      // 所有省份所形成的数组
      const provinceArr = this.allData.map((item) => {
        return item.name;
      });
      // 所有省份对应的销售金额
      const valueArr = this.allData.map((item) => {
        return item.value;
      });
      const dataOption = {
        xAxis: {
          data: provinceArr,
        },
        dataZoom: {
            show: false,
            startValue: this.startValue,
            endValue: this.endValue
        },
        series: [
          {
            data: valueArr,
            itemStyle: {
                color: (arg)=>{
                    let targetColorArr = null
                    if (arg.value > 300) {
                        targetColorArr = colorArr[0]
                    } else if (arg.value > 200) {
                        targetColorArr = colorArr[1]
                    } else {
                        targetColorArr = colorArr[2]
                    }
                    return new this.$echarts.graphic.LinearGradient(0, 0, 0, 1, [
                            {
                                offset: 0,
                                color: targetColorArr[0]
                            },
                            {
                                offset: 1,
                                color: targetColorArr[1]
                            }
                        ])
                }
            }
          },
        ],
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      const titleFontSize = this.$refs.rank_ref.offsetWidth / 100 * 3.6
      const adapterOption = {
        title: {
            textStyle: {
                fontSize: titleFontSize
            }
        },
        series: [
            {
                barWidth: titleFontSize,
                itemStyle: {
                    barBorderRadius: [titleFontSize / 2, titleFontSize / 2, 0, 0]
                }
            }
        ]
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    startInterval () {
        if (this.timerId) {
            clearInterval(this.timerId)
        }
        this.timerId = setInterval(() => {
            this.startValue++
            this.endValue++
            if(this.endValue > this.allData.length - 1){
                this.startValue = 0
                this.endValue = 9
            }
            this.updateChart()
        }, 2000)
    }
  },
  created() {
    this.$socket.registerCallBack('rankData', this.getData)
  },
};
</script>

<style lang="less" scoped>
</style>